Wireless charging and communication circuit, wireless electronic device, and wireless charging and communication circuit system

ABSTRACT

A charging circuit, an electronic device and a charging circuit system are provided. The charging circuit includes a receiving circuit and a signal processing circuit coupled to the receiving circuit; the receiving circuit is configured to receive electric energy wirelessly transmitted by a transmitting circuit and wirelessly transmit a feedback signal to the transmitting circuit according to the electric energy, and the signal processing circuit is configured to receive a control signal wirelessly transmitted by the transmitting circuit and process the control signal.

The present application claims priority of Chinese Patent ApplicationNo. 201810530497.6, filed on May 29, 2018, the disclosure of which isincorporated herein by reference in its entirety as part of the presentapplication.

TECHNICAL FIELD

Embodiments of the present disclosure relate to a wireless charging andcommunication circuit, a wireless electronic device, and a wirelesscharging and communication circuit system.

BACKGROUND

Passive electronic tags (also called passive tags) do not have built-inbatteries. In a case where the electronic tags are outside a readingrange of a reader, the electronic tags are in a passive state. In a casewhere the electronic tags are within the reading range of the reader,the electronic tags can be wirelessly charged by a wireless chargingcircuit.

SUMMARY

At least one embodiment of the present disclosure provides a wirelesscharging and communication circuit, which includes a receiving circuitand a signal processing circuit electrically connected to each other;the receiving circuit is configured to receive electric energywirelessly transmitted by a transmitting circuit and wirelessly transmita feedback signal to the transmitting circuit according to the electricenergy; and the signal processing circuit is configured to receive acontrol signal wirelessly transmitted by the transmitting circuit andprocess the control signal.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the receiving circuitincludes a first energy storage circuit, a first capacitor, arectification circuit, and a feedback circuit; a first terminal of thefirst energy storage circuit is electrically connected to a firstterminal of the first capacitor, a second terminal of the first energystorage circuit is electrically connected to a first terminal of therectification circuit, and the first energy storage circuit isconfigured to receive the electric energy wirelessly transmitted by thetransmitting circuit; a second terminal of the first capacitor iselectrically connected to a second terminal of the rectificationcircuit; a third terminal of the rectification circuit is electricallyconnected to a first voltage terminal, and the rectification circuit isconfigured to convert the electric energy into a direct-current voltageand output the direct-current voltage to the feedback circuit; and thefeedback circuit is electrically connected to the rectification circuit,and is configured to generate the feedback signal according to thedirect-current voltage and wirelessly transmit the feedback signal tothe transmitting circuit through the first energy storage circuit.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the feedback circuitcomprises a load modulation control terminal, a first switchsub-circuit, a load modulation resistor, and a load resistor; the loadmodulation control terminal is electrically connected to a firstterminal of the first switch sub-circuit; a second terminal of the firstswitch sub-circuit is electrically connected to a first terminal of theload modulation resistor, a third terminal of the first switchsub-circuit is electrically connected to the first voltage terminal, andthe first switch sub-circuit is configured to receive a modulationsignal, input from the load modulation control terminal, for modulatinga load and to be turned on or turned off according to the modulationsignal; a first terminal of the load resistor is electrically connectedto a second terminal of the load modulation resistor and therectification circuit, and a second terminal of the load resistor iselectrically connected to the first voltage terminal; and the loadmodulation resistor and the load resistor are configured to modulate aresistance value of the feedback circuit, according to a turn-on stateand a turn-off state of the first switch sub-circuit, to form thefeedback signal.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the feedback circuitcomprises a load modulation control terminal, a second switchsub-circuit, a load modulation capacitor, and a matching capacitor; theload modulation control terminal is electrically connected to a firstterminal of the second switch sub-circuit; a second terminal of thesecond switch sub-circuit is electrically connected to a first terminalof the load modulation capacitor, and a third terminal of the secondswitch sub-circuit is electrically connected to the first voltageterminal; a first terminal of the matching capacitor is electricallyconnected to the second terminal of the first capacitor, and a secondterminal of the matching capacitor is electrically connected to thesecond terminal of the first energy storage circuit; and a secondterminal of the load modulation capacitor is electrically connected tothe first terminal of the matching capacitor.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the signal processingcircuit comprises a decoding circuit, and the decoding circuit iselectrically connected to the receiving circuit; and the decodingcircuit is configured to receive the control signal wirelesslytransmitted by the transmitting circuit and decode the control signal.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the decoding circuitcomprises a first signal input terminal, a second signal input terminal,a high-pass filtering circuit, a switch circuit, a third capacitor, aresistance-capacitance charging circuit, a comparison circuit, a fourthcapacitor, and a signal output terminal; the first signal input terminalis electrically connected to the receiving circuit and is configured toreceive the control signal transmitted by the transmitting circuit; afirst terminal of the high-pass filtering circuit is electricallyconnected to the first signal input terminal, and a second terminal ofthe high-pass filtering circuit is electrically connected to a firstterminal of the switch circuit; a second terminal of the switch circuitis electrically connected to the comparison circuit, and a thirdterminal of the switch circuit is electrically connected to a firstvoltage terminal; a first terminal of the third capacitor iselectrically connected to the second signal input terminal, and a secondterminal of the third capacitor is electrically connected to the firstvoltage terminal; a first terminal of the resistance-capacitancecharging circuit is electrically connected to the second signal inputterminal, and a second terminal of the resistance-capacitance chargingcircuit is electrically connected to the first voltage terminal; thecomparison circuit is electrically connected to theresistance-capacitance charging circuit, the second signal inputterminal, the signal output terminal, and the first voltage terminal;and a first terminal of the fourth capacitor is electrically connectedto the signal output terminal, and a second terminal of the fourthcapacitor is electrically connected to the first voltage terminal.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the comparison circuitcomprises a comparator and a logic inversion circuit, and the decodingcircuit further comprises a resistance voltage division circuit; anon-inverting terminal of the comparator is electrically connected tothe second terminal of the switch circuit, an inverting terminal of thecomparator is electrically connected to the resistance voltage divisioncircuit, a first power supply terminal of the comparator is electricallyconnected to the second signal input terminal, a second power supplyterminal of the comparator is electrically connected to the firstvoltage terminal, and an output terminal of the comparator iselectrically connected to a first input terminal of the logic inversioncircuit; a second input terminal of the logic inversion circuit iselectrically connected to the second signal input terminal, and anoutput terminal of the logic inversion circuit is electrically connectedto the signal output terminal; and a first terminal of the resistancevoltage division circuit is electrically connected to the second signalinput terminal, and a second terminal of the resistance voltage divisioncircuit is electrically connected to the first voltage terminal.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the comparison circuitcomprises a trigger circuit, and the decoding circuit further comprisesa fifth capacitor; a first trigger terminal of the trigger circuit and asecond trigger terminal of the trigger circuit are both electricallyconnected to the second terminal of the switch circuit, a power supplyterminal of the trigger circuit and a reset terminal of the triggercircuit are both electrically connected to the second signal inputterminal, a control terminal of the trigger circuit is electricallyconnected to a first terminal of the fifth capacitor, a dischargeterminal of the trigger circuit and a ground terminal of the triggercircuit are both electrically connected to the first voltage terminal,and an output terminal of the trigger circuit is electrically connectedto the signal output terminal; and a second terminal of the fifthcapacitor is electrically connected to the first voltage terminal.

At least one embodiment of the present disclosure also provides awireless electronic device, which includes a main controller, acommunication controller, a power receiving controller, and the wirelesscharging and communication circuit according to any one of theembodiments of the present disclosure; the power receiving controllerand the communication controller are both electrically connected to thewireless charging and communication circuit; and the power receivingcontroller and the communication controller are both electricallyconnected to the main controller.

For example, the wireless electronic device provided by an embodiment ofthe present disclosure further includes an electronic tag, and theelectronic tag is electrically connected to the power receivingcontroller.

For example, in the wireless electronic device provided by an embodimentof the present disclosure, the electronic tag comprises an electronicink screen, and the electronic ink screen is configured to be suppliedwith power by the power receiving controller.

At least one embodiment of the present disclosure also provides awireless charging and communication circuit, which includes atransmitting circuit, and the transmitting circuit is configured towirelessly transmit electric energy to a receiving circuit, receive afeedback signal of the receiving circuit, and wirelessly transmit acontrol signal to the receiving circuit.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the transmitting circuitcomprises a control circuit and a second energy storage circuitelectrically connected to each other, and the control circuit is alsoelectrically connected to a power supply other than the wirelesscharging and communication circuit.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the control circuitcomprises a third energy storage circuit, a unidirectional conductionsub-circuit, a third switch sub-circuit, a feedback detection resistor,a load modulation feedback terminal, a power input terminal, and a thirdsignal input terminal; a first terminal of the third energy storagecircuit is electrically connected to the power input terminal, and asecond terminal of the third energy storage circuit is electricallyconnected to a first terminal of the second energy storage circuit; afirst terminal of the unidirectional conduction sub-circuit iselectrically connected to a second terminal of the second energy storagecircuit, and a second terminal of the unidirectional conductionsub-circuit is electrically connected to the first terminal of the thirdenergy storage circuit; a first terminal of the third switch sub-circuitis electrically connected to the second terminal of the second energystorage circuit, a second terminal of the third switch sub-circuit iselectrically connected to a first terminal of the feedback detectionresistor and the load modulation feedback terminal, a third terminal ofthe third switch sub-circuit is electrically connected to the thirdsignal input terminal, and the third switch sub-circuit is configured tobe turned on or turned off according to a charging control signal inputby the third signal input terminal; and a second terminal of thefeedback detection resistor is electrically connected to a first voltageterminal.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the third switch sub-circuitis a field-effect transistor, and the first terminal of the third switchsub-circuit, the second terminal of the third switch sub-circuit, andthe third terminal of the third switch sub-circuit are respectively adrain electrode of the field-effect transistor, a source electrode ofthe field-effect transistor, and a gate electrode of the field-effecttransistor; and the unidirectional conduction sub-circuit is a diode,and the first terminal of the unidirectional conduction sub-circuit andthe second terminal of the unidirectional conduction sub-circuit are apositive electrode of the diode and a negative electrode of the diode,respectively.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the control circuitcomprises a fourth switch sub-circuit, a fourth signal input terminal, afifth switch sub-circuit, a fifth signal input terminal, a third energystorage circuit, a power input terminal, a feedback detection resistor,and a load modulation feedback terminal; a first terminal of the fourthswitch sub-circuit is electrically connected to the power inputterminal, a second terminal of the fourth switch sub-circuit iselectrically connected to a first terminal of the third energy storagecircuit, a third terminal of the fourth switch sub-circuit iselectrically connected to the fourth signal input terminal, and thefourth switch sub-circuit is configured to be turned on or turned offaccording to a first charging control signal input by the fourth signalinput terminal; a first terminal of the fifth switch sub-circuit iselectrically connected to the second terminal of the fourth switchsub-circuit, a second terminal of the fifth switch sub-circuit iselectrically connected to a first terminal of the feedback detectionresistor, a third terminal of the fifth switch sub-circuit iselectrically connected to the fifth signal input terminal, and the fifthswitch sub-circuit is configured to be turned on or turned off accordingto a second charging control signal input by the fifth signal inputterminal; the first terminal of the feedback detection resistor iselectrically connected to the load modulation feedback terminal, asecond terminal of the feedback detection resistor is electricallyconnected to a first voltage terminal, and the feedback detectionresistor is configured to respond to the feedback signal transmitted bythe receiving circuit and output the feedback signal through the loadmodulation feedback terminal; and a second terminal of the third energystorage circuit is connected to a first terminal of the second energystorage circuit, and a second terminal of the second energy storagecircuit is electrically connected to the first voltage terminal.

For example, in the wireless charging and communication circuit providedby an embodiment of the present disclosure, the fourth switchsub-circuit is a first field-effect transistor, and the first terminalof the fourth switch sub-circuit, the second terminal of the fourthswitch sub-circuit, and the third terminal of the fourth switchsub-circuit are respectively a drain electrode of the first field-effecttransistor, a source electrode of the first field-effect transistor, anda gate electrode of the first field-effect transistor; and the fifthswitch sub-circuit is a second field-effect transistor, and the firstterminal of the fifth switch sub-circuit, the second terminal of thefifth switch sub-circuit, and the third terminal of the fifth switchsub-circuit are respectively a drain electrode of the secondfield-effect transistor, a source electrode of the second field-effecttransistor, and a gate electrode of the second field-effect transistor.

At least one embodiment of the present disclosure also provides awireless electronic device, which includes a power supply, a maincontroller, a communication controller, a power supply controller, andthe wireless charging and communication circuit according to any one ofthe embodiments of the present disclosure; and the communicationcontroller and the power supply controller are both electricallyconnected to the wireless charging and communication circuit.

At least one embodiment of the present disclosure also provides awireless charging and communication circuit system, which includes areceiving circuit, a signal processing circuit, and a transmittingcircuit; the receiving circuit is configured to receive electric energywirelessly transmitted by the transmitting circuit and wirelesslytransmit a feedback signal to the transmitting circuit according to theelectric energy; the signal processing circuit is configured to receivea control signal wirelessly transmitted by the transmitting circuit andprocess the control signal; and the transmitting circuit is configuredto wirelessly transmit the electric energy to the receiving circuit,receive the feedback signal of the receiving circuit, and wirelesslytransmit the control signal to the receiving circuit.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to clearly illustrate the technical solutions of theembodiments of the disclosure, the drawings of the embodiments arebriefly described in the following; it is obvious that the describeddrawings are only related to some embodiments of the disclosure and thusare not limitative to the disclosure.

FIG. 1A is a structural schematic diagram of a wireless charging andcommunication circuit provided by some embodiments of the presentdisclosure;

FIG. 1B is a schematic block diagram of a receiving circuit provided bysome embodiments of the present disclosure;

FIG. 2 is a schematic diagram of a circuit principle of a receivingcircuit provided by some embodiments of the present disclosure;

FIG. 3 is a schematic diagram of a circuit principle of anotherreceiving circuit provided by some embodiments of the presentdisclosure;

FIG. 4 is a schematic diagram of a circuit principle of still anotherreceiving circuit provided by some embodiments of the presentdisclosure;

FIG. 5 is a schematic diagram of a circuit principle of a decodingcircuit provided by some embodiments of the present disclosure;

FIG. 6 is a schematic diagram of a circuit principle of another decodingcircuit provided by some embodiments of the present disclosure;

FIG. 7A is a structural schematic diagram of another wireless chargingand communication circuit provided by some embodiments of the presentdisclosure;

FIG. 7B is a schematic block diagram of a control circuit provided bysome embodiments of the present disclosure;

FIG. 8 is a schematic diagram of a circuit principle of a transmittingcircuit provided by some embodiments of the present disclosure;

FIG. 9A is a schematic block diagram of another control circuit providedby some embodiments of the present disclosure;

FIG. 9B is a schematic diagram of a circuit principle of anothertransmitting circuit provided by some embodiments of the presentdisclosure;

FIG. 10 is a schematic diagram of a circuit principle of yet anotherwireless charging and communication circuit provided by some embodimentsof the present disclosure;

FIG. 11 is a schematic block diagram of a wireless electronic deviceprovided by some embodiments of the present disclosure;

FIG. 12 is a schematic block diagram of another wireless electronicdevice provided by some embodiments of the present disclosure; and

FIG. 13 is a schematic block diagram of yet another wireless electronicdevice provided by some embodiments of the present disclosure.

DETAILED DESCRIPTION

Embodiments of the present disclosure are described in detail below,examples of the embodiments are illustrated in accompanying drawings,and the same or similar reference numerals refer to the same or similarelements or elements having the same or similar functions throughout.The embodiments described below with reference to the accompanyingdrawings are exemplary and are only for the purpose of explaining thepresent disclosure and should not be construed as limitation of thepresent disclosure.

Those skilled in the art can understand that the singular forms “a”,“an” and “the” used herein may also include plural forms unlessexpressly stated. It should be further understood that the term“including” as used in the specification of the present disclosurerefers to existence of the features, integers, steps, operations,elements, and/or components, but does not preclude existence of oradding one or more other features, integers, steps, operations,elements, components, and/or groups thereof. It should be understoodthat when an element is called to be “connected” or “coupled” to anotherelement, it may be directly connected or coupled to the other element,or intervening elements may also be included. In addition, as usedherein, “connected” or “coupled” may include a wireless connection orwireless coupling. As used herein, the phrase “and/or” includes all orany element and all combinations of one or more associated listed items.

Those skilled in the art can understand that unless otherwise defined,all terms (including technical terms and scientific terms) used hereinhave the same meanings as commonly understood by those of ordinary skillin the art to which the present disclosure belongs. It should also beunderstood that terms such as those defined in general dictionariesshould be understood to have meanings consistent with those in thecontext of the prior art, and are not interpreted in idealized or overlyformal meanings unless specifically defined as herein.

Those skilled in the art can understand that the terms “terminal” and“terminal equipment” used herein include not only equipment of awireless signal receiver, which only has equipment of a wireless signalreceiver without transmitting capability, but also equipment ofreceiving and transmitting hardware, which has equipment of receivingand transmitting hardware capable of carrying out bidirectionalcommunication through a bidirectional communication link. The equipmentmay include: a cellular or other communication device, which has asingle-line display or a multi-line display, or is without a multi-linedisplay; a personal communications service (PCS), which can combinevoice, data processing, fax and/or data communication capabilities; apersonal digital assistant (PDA), which may include a radio frequencyreceiver, a pager, internet/intranet access, a web browser, a notepad, acalendar and/or a global positioning system (GPS) receiver; andconventional laptop and/or palmtop computers or other devices, whichhave and/or include radio frequency receivers. As used herein, the terms“terminal” and “terminal equipment” may be portable, transportable,installed in a vehicle (aviation, maritime and/or land), or adaptedand/or configured to operate locally, and/or operate in a distributedform at any other locations on earth and/or in space. As used herein,the terms “terminal” and “terminal equipment” may also be communicationterminals, internet terminals, music/video playing terminals, forexample, a personal digital assistant (PDA), a mobile internet device(MID), and/or mobile phones with music/video playing function, ordevices such as smart televisions and set-top boxes.

For a common passive electronic tag, it is usually impossible to performcommunication while charging the passive electronic tag, so a currentcharging state cannot be known in time. In a few cases, that is, somepassive electronic tags can perform communication while charging, buttheir circuit structure is very complex, and usually, onlyunidirectional communication can be realized, instead of bidirectionalcommunication.

For example, a wireless charging circuit can be used to charge thepassive electronic tag. A general wireless charging circuit is generallyset up according to a Qi standard, which has poor compatibility forcharging situations other than the Qi standard and has manyinconveniences in actual application.

In view of the above problems, some embodiments of the presentdisclosure provide a wireless charging and communication circuit, awireless electronic device, and a wireless charging and communicationcircuit system, which can solve the problems that communication cannotbe carried out or only unidirectional communication can be carried out,and there is poor compatibility in different charging applicationscenarios, in a case where the passive electronic tag is chargedwirelessly.

Some embodiments of the present disclosure have at least the followingbeneficial effects.

(1) A receiving circuit can be powered according to a charginginstruction, and bidirectional data communication based on atransmitting circuit and the receiving circuit can be realized whilecharging, thereby not only facilitating to know the charging state atreal-time, but also carrying out data transmission while charging.

(2) The circuit structure is simple, and good compatibility can berealized by the simple modification of parameter, which can be appliedin charging scenes under Qi standard as well as non-standard chargingscenes, thus improving the user's experience.

(3) In a case where the wireless charging and communication circuit isapplied in an electronic tag having an electronic ink screen, due to thefunction based on bidirectional data communication, the wirelesscharging and communication circuit of the embodiments of the presentdisclosure can supply power only in a case where the electronic inkscreen needs to refresh the screen, thereby saving energy.

The embodiments of the present disclosure are described in detail belowwith reference to the accompanying drawings.

In order to solve the problem that bidirectional communication cannot berealized while charging, some embodiments of the present disclosureprovide a wireless charging and communication circuit, the structure ofthe wireless charging and communication circuit is illustrated in FIG.1A, and the wireless charging and communication circuit includes areceiving circuit 10 and a signal processing circuit 20 electricallyconnected to each other. For example, the receiving circuit 10 iscoupled to a separately provided transmitting circuit by a wirelesssignal, that is, the receiving circuit 10 can communicate with theseparately provided transmitting circuit in a wireless way. Theseparately provided transmitting circuit may be coupled to the receivingcircuit 10 of the wireless charging and communication circuit, forexample.

The receiving circuit 10 and the signal processing circuit 20 may bedisposed in a device to be charged, for example, an electronic taghaving an electronic ink screen. For example, the electronic tag is apassive electronic tag. The receiving circuit 10 is used for receivingelectric energy wirelessly transmitted by the transmitting circuit andwirelessly transmitting a feedback signal to the transmitting circuitaccording to the electric energy; and the signal processing circuit 20is used for receiving a control signal wirelessly transmitted by thetransmitting circuit and performing corresponding signal processing onthe control signal, so that the control signal can be applied to acorresponding device to be charged. For example, the control signal maybe generated by the transmitting circuit according to the receivedfeedback signal, or may be generated according to other controlinstructions.

Referring to FIG. 1B, in some embodiments, the receiving circuit 10includes a first energy storage circuit 110, a first capacitor 120, arectification circuit 130, and a feedback circuit 140.

For example, a first terminal of the first energy storage circuit 110 iselectrically connected to a first terminal of the first capacitor 120, asecond terminal of the first energy storage circuit 110 is electricallyconnected to a first terminal of the rectification circuit 130, and thefirst energy storage circuit 110 is configured to receive the electricenergy wirelessly transmitted by the transmitting circuit.

A second terminal of the first capacitor 120 is electrically connectedto a second terminal of the rectification circuit 130.

A third terminal of the rectification circuit 130 is electricallyconnected to a first voltage terminal VSS (e.g., grounded), and therectification circuit 130 is configured to convert the electric energyinto a direct-current voltage and output the direct-current voltage tothe feedback circuit 140. For example, in the following description, theconnection to the first voltage terminal VSS can be understood to begrounded, and being grounded can also be understood as the connection tothe first voltage terminal VSS.

The feedback circuit 140 is electrically connected to the rectificationcircuit 130, and is configured to generate the feedback signal accordingto the direct-current voltage and transmit the feedback signal forfeeding back the current charging state to the transmitting circuitthrough the first energy storage circuit 140. The specific feedbackprinciple of the feedback circuit 140 is described in details in thefollowing sections.

By taking the circuit as illustrated in FIG. 2 as an example, thecharging and discharging principle of the receiving circuit 10 in someembodiments of the present disclosure is further explained below.

In FIG. 2, the first energy storage circuit 110 may be implemented as aninductance coil L1 (hereinafter referred to as “a receiving inductor”),and the first capacitor 120 may be implemented as a capacitor C102; andthe receiving inductor is coupled to a transmitting inductor in theseparately provided transmitting circuit, thereby receiving the electricenergy wirelessly transmitted by the transmitting inductor, andoutputting the direct-current voltage through the rectification circuit130 for the device to be charged.

Further, the feedback mode of the feedback circuit 140 includes twotypes: a resistance feedback mode and a capacitance feedback mode.

In a case where the feedback circuit 140 of some embodiments of thepresent disclosure adopts the resistance feedback mode, in someembodiments, the feedback circuit 140 includes a load modulation controlterminal, a first switch sub-circuit, a load modulation resistor, and aload resistor.

The load modulation control terminal is electrically connected to afirst terminal of the first switch sub-circuit; a second terminal of thefirst switch sub-circuit is electrically connected to a first terminalof the load modulation resistor, a third terminal of the first switchsub-circuit is electrically connected to the first voltage terminal VSS(e.g., grounded), and the first switch sub-circuit is configured toreceive a load modulation signal, input from the load modulation controlterminal, for modulating, and to be turned on or turned off according tothe load modulation signal.

A first terminal of the load resistor is electrically connected to asecond terminal of the load modulation resistor and the rectificationcircuit 130, and a second terminal of the load resistor is electricallyconnected to the first voltage terminal VSS (e.g., grounded); and theload modulation resistor and the load resistor are configured tomodulate a resistance value of the feedback circuit 140, according to aturn-on state and a turn-off state of the first switch sub-circuit, toform the feedback signal.

By taking the circuit as illustrated in FIG. 2 as an example, thefeedback principle of the feedback circuit 140 is further describedbelow.

In FIG. 2, the first switch sub-circuit is a metal-oxide-semiconductorfield-effect transistor (MOS transistor) Q102, and the first terminal ofthe first switch sub-circuit, the second terminal of the first switchsub-circuit and the third terminal of the first switch sub-circuit arerespectively a gate electrode of the MOS transistor Q102, a drainelectrode of the MOS transistor Q102, and a source electrode of the MOStransistor Q102. The load resistor is a resistor RL and the loadmodulation resistor is a resistor R102. The load modulation controlterminal is N1. It should be noted that, in the embodiments of thepresent disclosure, the first switch sub-circuit is not limited to beingimplemented as the MOS transistor Q102, but may also be a thin filmtransistor or other devices having similar characteristics, and theembodiments of the present disclosure are not limited to this case.

In a case where the load modulation signal received by the gateelectrode of the MOS transistor Q102 through the load modulation controlterminal N1 is at a high level, the MOS transistor Q102 is turned on, sothat the load modulation resistor R102 is connected in parallel with theload resistor RL, and an actual load resistance value of the receivingcircuit 10 is a resistance value after the load modulation resistor R102is connected in parallel with the load resistor RL; and in a case wherethe load modulation signal received by the gate electrode of the MOStransistor Q102 is at a low level, the MOS transistor Q102 is turned off(or off), and the actual load resistance value of the receiving circuit10 is a resistance value of the load resistor RL.

It can be seen that in a case where the load modulation signal changesbetween a high level and a low level, the actual load resistance valueof the receiving circuit 10 changes between two different resistancevalues, thus causing a voltage across the inductance coil L1 in thereceiving circuit 10 to change. Because the inductance coil L1 of thereceiving circuit 10 is coupled to the inductance coil of thetransmitting circuit (i.e., the transmitting inductor), in a case wherethe voltage across the inductance coil L1 in the receiving circuit 10changes, the voltage across the inductance coil of the transmittingcircuit also changes. The change of the voltage across the transmittinginductor can cause a change of current of a detection element (e.g., afeedback detection resistor) in the transmitting circuit, and thefeedback signal feeding back the change of the current is transmitted toa controller of the transmitting circuit from a load modulation feedbackterminal in the transmitting circuit, thus completing the feedbackprocess.

In order to better meet the actual needs of users, the resistance valueof the load modulation resistor, the resistance value of the loadresistor and resistance values of other resistors in some embodiments ofthe present disclosure can be set according to the actual needs, and thefeedback circuit 140 can be simultaneously connected to a plurality ofgroups of first switch sub-circuits and load modulation resistors inparallel.

The feedback circuit 140 as illustrated in FIG. 2 can be applied tovarious non-standard application scenarios and can meet personalized userequirements. In order to achieve compatibility with Qi standard andnon-standards, while the feedback circuit 140 as illustrated in FIG. 2is adopted, the receiving circuit 10 of some embodiments of the presentdisclosure is also electrically connected to a matching capacitor, suchas a capacitor C103 as illustrated in FIG. 3.

In a case where the feedback circuit 140 of some embodiments of thepresent disclosure adopts the capacitance feedback mode, in someexamples of some embodiments, the feedback circuit 140 includes a loadmodulation control terminal, a second switch sub-circuit, a loadmodulation capacitor, and a matching capacitor.

The load modulation control terminal is electrically connected to afirst terminal of the second switch sub-circuit; and a second terminalof the second switch sub-circuit is electrically connected to a firstterminal of the load modulation capacitor, and a third terminal of thesecond switch sub-circuit is electrically connected to the first voltageterminal VSS (e.g., grounded). The second switch sub-circuit is used forreceiving the load modulation signal, which is input by the loadmodulation control terminal, for modulation, and is turned on or turnedoff according to the load modulation signal.

A first terminal of the matching capacitor is electrically connected tothe second terminal of the first capacitor 120, and a second terminal ofthe matching capacitor is electrically connected to the second terminalof the first energy storage circuit 110.

By taking the circuit as illustrated in FIG. 4 as an example, thefeedback principle of the feedback circuit 140 described above isdescribed below.

As illustrated in FIG. 4, the second switch sub-circuit is a MOStransistor Q103, and the first terminal of the second switchsub-circuit, the second terminal of the second switch sub-circuit, andthe third terminal of the second switch sub-circuit are respectively agate electrode of the MOS transistor Q103, a drain electrode of the MOStransistor Q103, and a source electrode of the MOS transistor Q103. Thematching capacitor is a capacitor C103, and the load modulationcapacitor is a capacitor C110. The load modulation control terminal isN1. It should be noted that, in the embodiments of the presentdisclosure, the second switch sub-circuit is not limited to beingimplemented as the MOS transistor Q103, but may also be a thin filmtransistor or other devices having similar characteristics, and theembodiments of the present disclosure are not limited to this case.

In a case where the load modulation signal received by the gateelectrode of the MOS transistor Q103 through the load modulation controlterminal N1 is at a high level, the MOS transistor Q103 is turned on, sothat the load modulation capacitor C110 is connected in parallel withthe matching capacitor C103, and an actual capacitance value of thereceiving circuit 10 is a capacitance value after the load modulationcapacitor C110 is connected in parallel with the matching capacitorC103; and in a case where the load modulation signal received by thegate electrode of the MOS transistor Q103 is at a low level, the MOStransistor Q103 is turned off, and the actual capacitance value of thereceiving circuit 10 is a capacitance value of the matching capacitorC103.

It can be seen that in a case where the load modulation signal changesbetween a high level and a low level, the actual capacitance value ofthe receiving circuit 10 changes between two different capacitancevalues, thus causing the voltage across the inductance coil L1 in thereceiving circuit 10 to change. Because the inductance coil L1 of thereceiving circuit 10 is coupled to the inductance coil of thetransmitting circuit (i.e., the transmitting inductor), in a case wherethe voltage across the inductance coil L1 in the receiving circuit 10changes, the voltage across the inductance coil of the transmittingcircuit also changes. The change of the voltage across the transmittinginductor can cause a change of current of the detection element (e.g.,the feedback detection resistor) in the transmitting circuit, and thefeedback signal feeding back the change of the current is transmitted tothe controller of the transmitting circuit by the load modulationfeedback terminal in the transmitting circuit, thus completing thefeedback process.

In order to better meet the actual needs of the users, the capacitancevalue of the load modulation capacitor, the capacitance value of thematching capacitor and capacitance values of other capacitors in someembodiments of the present disclosure can be set according to the actualneeds, and the feedback circuit 140 can be simultaneously connected to aplurality of groups of second switch sub-circuits and load modulationcapacitors in parallel.

In other embodiments, the feedback circuit 140 includes a loadmodulation control terminal, a first switch sub-circuit, a loadmodulation capacitor, and a load resistor, i.e., the load modulationcapacitor replaces the load modulation resistor R102 as illustrated inFIG. 2 or FIG. 3. The connection relationship and feedback principle ofthe feedback circuit 140 are similar to those as illustrated in FIG. 2or FIG. 3, and are not described here again.

In other embodiments, a sixth switch sub-circuit, such as a MOStransistor, may be connected to a branch where the matching capacitor islocated, and the turn-on and turn-off of the circuit, to which thematching capacitor belongs, may be controlled by the load modulationsignal received by the sixth switch sub-circuit. For example, in a casewhere the load modulation signal is at a high level, the circuit isturned on, and in a case where the load modulation signal is at a lowlevel, the circuit is turned off, so that the capacitance value of thereceiving circuit 10 changes with the change of the load modulationsignal, and the voltage across the inductance coil L1 changesaccordingly, and further the feedback detection resistance of thetransmitting circuit changes caused by the transmitting inductor in thetransmitting circuit.

For example, the rectification circuit 130 in some embodiments of thepresent disclosure includes a first rectification sub-circuit (a diodeD102 as illustrated in FIG. 2), a second rectification sub-circuit (adiode D103 as illustrated in FIG. 2), a third rectification sub-circuit(a diode D104 as illustrated in FIG. 2), a fourth rectificationsub-circuit (a diode D105 as illustrated in FIG. 2), and a sixthcapacitor (a capacitor C104 as illustrated in FIG. 2), the connectionrelationship of which is illustrated in FIG. 2.

In some embodiments, the signal processing circuit 20 includes adecoding circuit electrically connected to the receiving circuit 10, andis configured to receive the control signal generated, for example,according to the feedback signal, and transmitted by the transmittingcircuit, and decode the control signal. Further, the signal processingcircuit 20 of some embodiments of the present disclosure includes adecoding circuit as illustrated in FIG. 5 or FIG. 6.

For example, as illustrated in FIG. 5 or FIG. 6, the decoding circuitdescribed above includes a first signal input terminal in, a secondsignal input terminal P+, a high-pass filtering circuit, a switchcircuit, a third capacitor, a resistance-capacitance charging circuit(or referred to as a RC charging circuit), a comparison circuit, afourth capacitor, and a signal output terminal out.

The first signal input terminal in and the second signal input terminalP+ are both electrically connected to the receiving circuit 10, forexample, connected to the inductance coil L1 of the receiving circuit10. For example, in some embodiments, the first signal input terminal inand the second signal output terminal P+ are electrically connected todifferent terminals of the inductance coil L1. For example, in otherembodiments, the first signal input terminal in is electricallyconnected to the second terminal of the first capacitor C102, the firstsignal input terminal in is used for receiving the control signaltransmitted by the transmitting circuit, and the second signal outputterminal P+ is electrically connected to the second terminal of theinductance coil L1.

A first terminal of the high-pass filtering circuit is electricallyconnected to the first signal input terminal in, a second terminal ofthe high-pass filtering circuit is electrically connected to a firstterminal of the switch circuit, and the high-pass filtering circuit isused for filtering the control signal received by the first signal inputterminal in to prevent a direct-current voltage from affecting theswitch circuit. Further, the high-pass filtering circuit includes asixth capacitor (a capacitor C1 as illustrated in FIG. 5 or FIG. 6) anda first resistor (a resistor R1 as illustrated in FIG. 5 or FIG. 6), afirst terminal of the capacitor C1 is electrically connected to thefirst signal input terminal in, a second terminal of the capacitor C1 iselectrically connected to a first terminal of the resistor R1 and thefirst terminal of the switch circuit, and a second terminal of theresistor R1 is grounded.

A second terminal of the switch circuit is electrically connected to thecomparison circuit, and a third terminal of the switch circuit isgrounded, and the switch circuit is turned on or turned off according todifferent signals that are received, thereby controlling a chargingstate and a discharging state of the resistance-capacitance chargingcircuit. Further, the switch circuit includes a current limitingresistor R2 and a transistor Q1, a first terminal of the currentlimiting resistor R2 is electrically connected to a second terminal ofthe capacitor C1, a second terminal of the current limiting resistor R2is electrically connected to a base electrode of the transistor Q1, acollecting electrode of the transistor Q1 is electrically connected tothe resistance-capacitance charging circuit and the comparison circuit,and a emitting electrode of the transistor Q1 is grounded.

The third capacitor is, for example, a capacitor C2 as illustrated inFIG. 5 or FIG. 6. A first terminal of the capacitor C2 is electricallyconnected to the second signal input terminal P+, and a second terminalof the capacitor C2 is grounded.

A first terminal of the resistance-capacitance charging circuit iselectrically connected to the second signal input terminal P+, a secondterminal of the resistance-capacitance charging circuit is grounded, athird terminal of the resistance-capacitance charging circuit iselectrically connected to the collecting electrode of the transistor Q1,and the resistance-capacitance charging circuit can discharge throughthe transistor Q1. Further, the circuit principle of theresistance-capacitance charging circuit may be referred to FIG. 5,including a resistor R3 and a capacitor C3; and a first terminal of theresistor R3 is electrically connected to the second signal inputterminal P+, a second terminal of the resistor R3 is electricallyconnected to a first terminal of the capacitor C3, the collectingelectrode of the transistor Q1, and the comparison circuit, and a secondterminal of the capacitor C3 is grounded.

The comparison circuit is electrically connected to theresistance-capacitance charging circuit, the second signal inputterminal P+, the collecting electrode of the transistor Q1 and thesignal output terminal out, and is also grounded. A first terminal ofthe fourth capacitor is electrically connected to the signal outputterminal out, and a second terminal of the fourth capacitor is grounded,for example.

For example, the comparison circuits in some embodiments of the presentdisclosure may compare the input signals that are received and outputdecoded signals.

Referring to FIG. 5, in some embodiments, the comparison circuitincludes a comparator U1 and a logic inversion circuit U2, which cancomplete decoding of signals according to an amplitude modulationmethod. The logic inversion circuit U2 may be a NAND gate, an inverteror the like, to realize the function of inverting the signal. Forexample, the comparator U1 and the logic inversion circuit U2 may beindependent chips or circuits, or they may be implemented by comparatorsand NAND gates inside a microcontroller unit (MCU), and the decoding ofsignals is completed by software logic.

The decoding circuit also includes a resistance voltage divisioncircuit. The resistance voltage division circuit comprises a firstvoltage division resistor R4 and a second voltage division resistor R5which are electrically connected, and a specific resistance value of R4and a specific resistance value of R5 can be set according to actualrequirements, or other voltage division resistors can be added. A firstterminal of the first voltage division resistor R4 is electricallyconnected to the second signal input terminal P+, and a second terminalof the first voltage division resistor R4 is electrically connected to afirst terminal of the second voltage division resistor R5 and aninverting terminal of the comparator U1. A second terminal of the secondvoltage division resistor R2 is grounded.

A non-inverting terminal of the comparator U1 is electrically connectedto the second terminal of the switch circuit, for example, to thecollecting electrode of the transistor Q1. The inverting terminal of thecomparator U1 is electrically connected to the resistance voltagedivision circuit, for example, connected to the second terminal of thefirst voltage division resistor R4. A first power supply terminal of thecomparator U1 is electrically connected to the second signal inputterminal P+, a second power supply terminal of the comparator U1 isgrounded, for example, and an output terminal of the comparator U1 iselectrically connected to a first input terminal of the logic inversioncircuit U2. A second input terminal of the logic inversion circuit U2 iselectrically connected to the second signal input terminal P+, and anoutput terminal of the logic inversion circuit U2 is electricallyconnected to the signal output terminal out; and a first terminal of theresistance voltage division circuit is electrically connected to thesecond signal input terminal P+, and a second terminal of the resistancevoltage division circuit is grounded.

By taking the circuit as illustrated in FIG. 5 as an example, theoperation principle of the comparison circuit is further describedbelow.

The base electrode of transistor Q1 receives a control signal inputthrough the first signal input terminal in and filtered by the high-passfiltering circuit, and the transistor Q1 switches between a turn-onstate and a turn-off state according to a frequency of the controlsignal; and in a case where the transistor Q1 is turned on or turnedoff, the resistance-capacitance charging circuit (i.e., RC chargingcircuit) is in a discharging state or a charging state respectively. Thevoltages across the capacitor C3 are different in different states, sothe voltages received by the non-inverting terminal of the comparator U1electrically connected to the capacitor C3 are different. For example,by reasonably setting the resistance value of the resistor R4 and theresistance value of the resistor R5, the voltage at the invertingterminal of the comparator U1 is kept at a certain voltage value (i.e.,a setting threshold). Because the voltage received by the non-invertingterminal of the comparator U1 changes with the turn-on or turn-off ofthe transistor Q1, the voltage output at the output terminal of thecomparator U1 also changes accordingly. Furthermore, the output voltageof the logic inversion circuit U2 is correspondingly different accordingto the difference of the output voltage of the comparator U1.

For example, the comparator U1 compares the voltage received at thenon-inverting terminal of the comparator U1 with the setting threshold.In a case where the voltage received at the non-inverting terminal ishigher than or equal to the setting threshold, the output terminal ofthe comparator U1 outputs a low-level signal to the logic inversioncircuit U2. In a case where the voltage received at the non-invertingterminal is lower than the setting threshold, the output terminal of thecomparator U1 outputs a low-level signal to the logic inversion circuitU2. For example, the setting threshold is set as the voltage value atthe inverting terminal of the comparator U1. The specific value is notlimited to this value and can be determined according to actualrequirements. The setting threshold can be obtained by setting theresistance value of the resistor R4 and the resistance value of theresistor R5 to divide the voltages.

The first input terminal of the logic inversion circuit U2 receives ahigh-level signal input by the second signal input terminal P+, andcontrols the signal of the output terminal of the logic inversioncircuit U2 to be output according to the signal received by the secondinput terminal of the logic inversion circuit U2; and in a case wherethe second input terminal of the logic inversion circuit U2 receives ahigh-level signal transmitted by the comparator U1, the output terminalof the logic inversion circuit U2 outputs a low-level signal, and in acase where the second input terminal of the logic inversion circuit U2receives a low-level signal transmitted by the comparator U1, the outputterminal of the logic inversion circuit U2 outputs a high-level signal.In this way, the inversion of the signal can be realized, and thedecoded signal is output through the signal output terminal out.

Referring to FIG. 6, in other embodiments, the comparison circuitincludes a trigger circuit (or called as a 555 timer), and the decodingcircuit further includes a fifth capacitor (e.g., a capacitor C5). Thetrigger circuit is used to replace the comparator U1 and the logicinversion circuit U2 as illustrated in FIG. 5, which can improve theintegration level of the circuit.

A first trigger terminal (i.e., a low trigger terminal or a TR terminal,i.e., a TRIGGER terminal as illustrated in FIG. 6) and a second triggerterminal (i.e., a high trigger terminal or a TH terminal, i.e., aTHRESHOLD terminal as illustrated in FIG. 6) of the 555 timer are bothelectrically connected to the second terminal of the switch circuit. Forexample, the TR terminal and the TH terminal are both electricallyconnected to the collecting electrode of the transistor Q1 for receivingthe control signal amplified by the switch circuit.

A power supply terminal (a VCC terminal as illustrated in FIG. 6) and areset terminal (a RESET terminal as illustrated in FIG. 6) of the 555timer are both electrically connected to the second signal inputterminal P+; and the power supply terminal of the 555 timer receives ahigh-level signal of the second signal input terminal P+.

A control terminal of the 555 timer (i.e., a CONTROL terminal asillustrated in FIG. 6) is electrically connected to a first terminal ofthe fifth capacitor C5, and a second terminal of the fifth capacitor C5is grounded. A discharge terminal (i.e., a DISCHARGE terminal asillustrated in FIG. 6) and a ground terminal (i.e., a GND terminal asillustrated in FIG. 6) of the 555 timer are both grounded.

An output terminal of the 555 timer (i.e., an OUTPUT terminal asillustrated in FIG. 6) is electrically connected to the signal outputterminal out for outputting a decoded low-level pulse signal.

By taking the circuit as illustrated in FIG. 6 as an example, theoperation principle of the comparison circuit is described as follows.

The base electrode of the transistor Q1 receives the control signalinput through the first signal input terminal in and filtered by thehigh-pass filtering circuit, and the transistor Q1 switches between aturn-on state and a turn-off state according to the frequency of thecontrol signal; and the 555 timer and the RC charging circuit form aSchmitt trigger. The RC charging circuit includes the resistor R3 andthe capacitor C3, both of which are electrically connected to thetransistor Q1, and the capacitor C3 is also electrically connected tothe TR terminal and the TH terminal of the 555 timer (for detailedelectrical connection relationship, the foregoing content or FIG. 6 canbe referred to).

In a case where the transistor Q1 is turned on or turned off at acertain switch frequency, the RC charging circuit switches between thedischarging state and the charging state at the same frequency. Thevoltages across the capacitor C3 are different in different states, andthe voltages received by the TR terminal and the TH terminal,electrically connected to the capacitor C3, of the 555 timer, aredifferent, so the voltages output from the output terminal OUTPUT of the555 timer are also different.

For example, in a case where the RC charging circuit is in thedischarging state, the discharging speed of the capacitor C3 is faster,so the voltage across the capacitor C3 drops faster in a short time.Further, in a case where the switch frequency of the transistor Q1 isgreater than the setting threshold, because the discharging frequency ofthe capacitor C3 is higher and the discharging speed is faster, the twoterminals of the capacitor C3 are kept at a lower voltage, and thevoltages received by the TR terminal and the TH terminal of the 555timer are correspondingly lower, thus the logic leaping voltage cannotbe reached. At this time, the output terminal OUTPUT of the 555 timeroutputs a high-level signal.

In a case where the switch frequency of the transistor Q1 is not greaterthan the above-mentioned setting threshold, because the dischargingfrequency of the capacitor C3 is relatively low, the two terminals ofthe capacitor C3 can reach and maintain a higher voltage.Correspondingly, the voltages received by the TR terminal and the THterminal of the 555 timer can reach the logic leaping voltage. At thistime, the output terminal OUTPUT of the 555 timer outputs a low-levelsignal.

The 555 timer reverses the signal in the above-mentioned way, and thenoutputs the decoded signal through the signal output terminal out.

Some embodiments of the present disclosure also provide a wirelesscharging and communication circuit, which includes a transmittingcircuit.

The transmitting circuit is wirelessly coupled to a receiving circuitwhich is separately provided.

The transmitting circuit can be arranged in various charging devicessuch as fixed terminals or handheld terminals, and is used forwirelessly transmitting electric energy to the receiving circuit whichis separately provided, receiving a feedback signal transmitted by thereceiving circuit, and wirelessly transmitting a control signalgenerated according to the feedback signal, for example, to thereceiving circuit.

In a case where the wireless charging and communication circuit providedby some embodiments of the present disclosure is applied in a chargingsystem of the electronic tag, power is supplied to the electronic tagupon receiving a screen refresh instruction, and the electronic inkscreen in the electronic tag is controlled to refresh the screen byusing the control signal; and in a case where the wireless charging andcommunication circuit provided by some embodiments of the presentdisclosure is applied in other scenes, the transmission of the controlsignal can realize corresponding data communication in an usage scene.

Referring to FIG. 7A, in some embodiments, the transmitting circuitincludes a control circuit 30 and a second energy storage circuit 40electrically connected to each other. For example, the control circuit30 is also electrically connected to a power supply other than thewireless charging and communication circuit of some embodiments of thepresent disclosure for transmitting the electric energy of the powersupply to the second energy storage circuit 40, and the second energystorage circuit 40 is used for storing the electric energy andwirelessly transmitting the electric energy to the receiving circuitwhich is separated provided.

For example, the control circuit 30 in some embodiments of the presentdisclosure includes a third switch sub-circuit 310, a third signal inputterminal N3, a third energy storage circuit 320, a unidirectionalconduction sub-circuit 330, a feedback detection resistor 340, a loadmodulation feedback terminal N4, and a power input terminal NP, and theschematic block diagram of the control circuit 30 is illustrated in FIG.7B.

A first terminal of the third switch sub-circuit 310 is electricallyconnected to a second terminal of the second energy storage circuit 40,a second terminal of the third switch sub-circuit 310 is electricallyconnected to a first terminal of the feedback detection resistor 340 andthe load modulation feedback terminal N4, a third terminal of the thirdswitch sub-circuit 310 is electrically connected to the third signalinput terminal N3, and the third switch sub-circuit 310 is configured tobe turned on or turned off, according to a charging control signal inputby the third signal input terminal N3, to control a turn-on/turn-offstate of the circuit to which the third switch sub-circuit 310 belongs.

A first terminal of the third energy storage circuit 320 is alsoelectrically connected to the power input terminal NP to receive theelectric energy from a separately provided power supply. A secondterminal of the third energy storage circuit 320 is electricallyconnected to a first terminal of the second energy storage circuit 40.The third energy storage circuit 320 is used to transmit the electricenergy of the power supply to the second energy storage circuit 40 in acase where the charging control signal input by the third signal inputterminal N3 is at a high level, and to store the electric energyreleased by the second energy storage circuit 40 in a case where thecharging control signal is at a low level.

A first terminal of the unidirectional conduction sub-circuit 330 iselectrically connected to the second terminal of the second energystorage circuit 40, and a second terminal of the unidirectionalconduction sub-circuit 330 is electrically connected to the firstterminal of the third energy storage circuit 320. In a case where thecharging control signal is at a low level, the second energy storagecircuit 40 releases electric energy, and the unidirectional conductionsub-circuit 330 enables the current to only flow from the first terminalof the unidirectional conduction sub-circuit 330 to the second terminalof the unidirectional conduction sub-circuit 330.

A first terminal of the feedback detection resistor 340 is electricallyconnected to the load modulation feedback terminal N4, and a secondterminal of the feedback detection resistor 340 is connected to thefirst voltage terminal VSS (e.g., grounded), the feedback detectionresistor 340 is used for detecting a feedback signal transmitted by thereceiving circuit which is separately provided, and the specificprinciple of the feedback detection resistor 340 is described in detailin followings.

By taking the circuit as illustrated in FIG. 8 as an example, thecharging and discharging operation principle of the transmitting circuitin some embodiments of the present disclosure is further described.

In FIG. 8, the second energy storage circuit 40 is an inductance coil L2(referred to as a “transmitting inductor” below), the third energystorage circuit 320 is a capacitor C101, and the feedback detectionresistor 340 is a resistor R101. The third switch sub-circuit 310 is aMOS transistor Q101. At this time, the first terminal of the thirdswitch sub-circuit 310, the second terminal of the third switchsub-circuit 310, and the third terminal of the third switch sub-circuit310 are respectively a drain electrode of the MOS transistor Q101, asource electrode of the MOS transistor Q101, and a gate electrode of theMOS transistor Q101. The unidirectional conduction sub-circuit 330 is adiode D101, and in this case, the first terminal of the unidirectionalconduction sub-circuit 330 and the second terminal of the unidirectionalconduction sub-circuit 330 are an anode of the diode D101 and a cathodeof the diode D101, respectively.

The charging control signal input from the third signal input terminalN3 is usually a pulse signal converted at a certain frequency, such as apulse width modulation (PWM) signal. In a case where the chargingcontrol signal is at a high level, the MOS transistor Q101 is turned on,and the circuit to which the MOS transistor Q101 belongs is also turnedon. The power supply connected to the control circuit 30 charges thetransmitting inductor L2 through the capacitor C101. In a case where thecharging control signal is at a low level, the MOS transistor Q101 isturned off, and the circuit to which the MOS transistor Q101 belongs isturned off. The transmitting inductor L2, the diode D101, and thecapacitor C101 form a discharge loop, and the transmitting inductor L2releases the electric energy through the discharge loop.

For example, in other embodiments, the control circuit 30 includes afourth switch sub-circuit 350, a fourth signal input terminal N5, afifth switch sub-circuit 360, a fifth signal input terminal N6, a thirdenergy storage circuit 320, a feedback detection resistor 340, a loadmodulation feedback terminal N4, and a power input terminal NP, and theschematic block diagram of the control circuit 30 is illustrated in FIG.9A.

A first terminal of the fourth switch sub-circuit 350 is electricallyconnected to the power input terminal NP to receive the electric energyprovided by the power supply which is separately provided, a secondterminal of the fourth switch sub-circuit 350 is electrically connectedto a first terminal of the third energy storage circuit 320, a thirdterminal of the fourth switch sub-circuit 350 is electrically connectedto the fourth signal input terminal N5, and the fourth switchsub-circuit 350 is configured to be turned on or turned off according toa first charging control signal input by the fourth signal inputterminal N5. For example, the fourth switch sub-circuit 350 is turned onin a case where the first charging control signal is at a high level andis turned off in a case where the first charging control signal is at alow level.

A first terminal of the fifth switch sub-circuit 360 is electricallyconnected to the second terminal of the fourth switch sub-circuit 350, asecond terminal of the fifth switch sub-circuit 360 is electricallyconnected to a first terminal of the feedback detection resistor 340, athird terminal of the fifth switch sub-circuit 360 is electricallyconnected to the fifth signal input terminal N6, and the fifth switchsub-circuit 360 is configured to be turned on or turned off according toa second charging control signal input by the fifth signal inputterminal N6, to control the circuit, to which the fifth switchsub-circuit 360 belongs, to be turned on or turned off. For example, thefifth switch sub-circuit 360 is turned on in a case where the secondcharging control signal is at a high level and is turned off in a casewhere the second charging control signal is at a low level.

The first terminal of the feedback detection resistor 340 iselectrically connected to the load modulation feedback terminal N4, asecond terminal of the feedback detection resistor 340 is electricallyconnected to the first voltage terminal VSS (for example, grounded), andthe feedback detection resistor 340 is configured to respond to thefeedback signal transmitted by the receiving circuit and output thefeedback signal through the load modulation feedback terminal N4. Thespecific principle of the feedback detection resistor 340 is describedin details in followings.

A second terminal of the third energy storage circuit 320 is connectedto a first terminal of the second energy storage circuit 40, and asecond terminal of the second energy storage circuit 40 is connected tothe first voltage terminal VSS (e.g., grounded).

By taking the circuit as illustrated in FIG. 9B as an example, thecharging and discharging operation principle of the transmitting circuitin some embodiments of the present disclosure is further describedbelow.

In FIG. 9B, the second energy storage circuit 40 is an inductance coilL2 (referred to as a “transmitting inductor” below), the third energystorage circuit 320 is a capacitor C101, and the feedback detectionresistor 340 is a resistor R101. The fourth switch sub-circuit 350 is afirst field-effect transistor (e.g., a MOS transistor Q201), and thefirst terminal of the fourth switch sub-circuit 350, the second terminalof the fourth switch sub-circuit 350, and the third terminal of thefourth switch sub-circuit 350 are respectively a drain electrode of theMOS transistor Q201, a source electrode of the MOS transistor Q201, anda gate electrode of the MOS transistor Q201. The fifth switchsub-circuit 360 is a second field-effect transistor (e.g., a MOStransistor Q202), and the first terminal of the fifth switch sub-circuit360, the second terminal of the fifth switch sub-circuit 360, and thethird terminal of the fifth switch sub-circuit 360 are respectively adrain electrode of the MOS transistor Q202, a source electrode of theMOS transistor Q202, and a gate electrode of the MOS transistor Q202.

The first charging control signal input from the fourth signal inputterminal N5 and the second charging control signal input from the fifthsignal input terminal N6 are usually pulse signals converted at acertain frequency, such as pulse width modulation (PWM) signals.

In a case where the first charging control signal is at a high level andthe second charging control signal is at a low level, the MOS transistorQ201 is turned on, and the circuit to which the MOS transistor Q201belongs is also turned on, the MOS transistor Q202 is turned off, andthe power supply connected to the control circuit 30 charges thetransmitting inductor L2 through the capacitor C101.

In a case where the first charging control signal is at a low level andthe second charging control signal is at a high level, the MOStransistor Q201 is turned off, the circuit to which the MOS transistorQ201 belongs is turned off, the MOS transistor Q202 is turned on, thetransmitting inductor L2, the MOS transistor Q202 and the capacitor C101form a discharge loop, and the transmitting inductor L2 releases theelectric energy through the discharge loop.

It should be noted that the wireless charging and communication circuitincluding the receiving inductor L1 and the wireless charging andcommunication circuit including the transmitting inductor L2 can worktogether, and the receiving inductor L1 and the transmitting inductor L2are coupled to each other to wirelessly transmit the electric energy.For example, the circuit as illustrated in FIG. 2 can cooperate with thecircuit as illustrated in FIG. 8. As illustrated in FIG. 10, thereceiving inductor L1 in the wireless charging and communication circuit50 and the transmitting inductor L2 in the wireless charging andcommunication circuit 60 are coupled to each other. In a case where thecircuit as illustrated in FIG. 10 is applied in a charging system of anelectronic tag, the wireless charging and communication circuit 50 canbe disposed in the electronic tag, and the wireless charging andcommunication circuit 60 can be disposed in a charging device such as afixed terminal or a handheld terminal. For example, the signalprocessing circuit (i.e., the decoding circuit) as illustrated in FIG. 5or FIG. 6 may also be deposed in the electronic tag, and the decodingcircuit may be electrically connected to the first capacitor C102according to the connection mode described above, thereby realizing thesignal decoding function. The wireless charging and communicationcircuit 50 may also generate a feedback signal and transmit the feedbacksignal to the wireless charging and communication circuit 60 through aninductive coupling function to realize a signal feedback function. Inthis way, the wireless charging and communication circuit 50 and thewireless charging and communication circuit 60 can realize bidirectionaldata communication while transmitting the electric energy.

Some embodiments of the present disclosure also provide a wirelesscharging and communication circuit system, which includes a receivingcircuit, a signal processing circuit, and a transmitting circuit. Thereceiving circuit is configured to receive electric energy wirelesslytransmitted by the transmitting circuit and wirelessly transmit afeedback signal to the transmitting circuit according to the electricenergy. The signal processing circuit is configured to receive a controlsignal wirelessly transmitted by the transmitting circuit and processthe control signal. The transmitting circuit is configured to wirelesslytransmit the electric energy to the receiving circuit, receive thefeedback signal of the receiving circuit, and wirelessly transmit thecontrol signal to the receiving circuit. For example, in some examples,the wireless charging and communication circuit system is a combinationof the circuit as illustrated in FIG. 10 and the circuit as illustratedin FIG. 5 or in FIG. 6. The working principle of the wireless chargingand communication circuit system can be referred to the foregoingcontent and is not described here again.

Based on the above embodiments, the wireless charging and communicationcircuit provided by some embodiments of the present disclosure has atleast the following beneficial effects.

(1) A receiving circuit can be powered according to a charginginstruction, and bidirectional data communication based on atransmitting circuit and the receiving circuit can be realized whilecharging, thus facilitating to knowing the charging state at real-time.

(2) The circuit structure is simple, and good compatibility can berealized through the simple parameter modification, which can be appliedin charging scenes under Qi standard as well as non-standard chargingscenes, thus improving the user's experience.

(3) In a case where the wireless charging and communication circuit isapplied in an electronic tag having an electronic ink screen, based onthe function of bidirectional data communication, the wireless chargingand communication circuit of the embodiments of the present disclosurecan only supply power in a case where the electronic ink screen needs torefresh the screen, thereby saving energy.

Some embodiments of the present disclosure also provide a wirelesselectronic device, which includes a main controller, a communicationcontroller, a power receiving controller, and the wireless charging andcommunication circuit provided by any one of the embodiments of thepresent disclosure.

As illustrated in FIG. 11, the power receiving controller and thecommunication controller are both electrically connected to the wirelesscharging and communication circuit; and the main controller iselectrically connected to the communication controller and the powerreceiving controller. For example, the wireless charging andcommunication circuit includes a receiving inductor L1. For example, themain controller, the communication controller and the power receivingcontroller cooperate with each other to control the wireless chargingand communication circuit, for example, to provide the aforementionedsignals to the wireless charging and communication circuit, and tocollect signals generated by the wireless charging and communicationcircuit.

For example, in some embodiments, as illustrated in FIG. 12, thewireless electronic device further includes an electronic tagelectrically connected to the power receiving controller. The electronictag includes, for example, an electronic ink screen, and the electronicink screen is electrically connected to the power receiving controllerand configured be supplied with power by the power receiving controller.It should be noted that the main controller, the communicationcontroller and the power receiving controller can be dedicated orgeneral-purpose circuits, chips, firmware, etc., and the three can beseparate devices or integrated into one device. The embodiments of thepresent disclosure are not limited to this case.

The beneficial effects that the wireless electronic device provided bysome embodiments of the present disclosure can achieve are basically thesame as the beneficial effects of the wireless charging andcommunication circuit provided by the embodiments of the presentdisclosure, which are not repeated herein again.

Some embodiments of the present disclosure also provide a wirelesselectronic device, which includes a power supply, a main controller, acommunication controller, a power supply controller, and the wirelesscharging and communication circuit provided by any one of theembodiments of the present disclosure.

As illustrated in FIG. 13, the communication controller and the powersupply controller are both electrically connected to the wirelesscharging and communication circuit, the main controller is electricallyconnected to the communication controller and the power supplycontroller, and the power supply is electrically connected to the maincontroller and the power supply controller. For example, the wirelesscharging and communication circuit includes a transmitting inductor L2.For example, the main controller, the communication controller and thepower supply controller cooperate with each other to control thewireless charging and communication circuit, for example, to provide theaforementioned signals to the wireless charging and communicationcircuit, and to collect signals generated by the wireless charging andcommunication circuit.

It should be noted that the main controller, the communicationcontroller and the power supply controller can be dedicated orgeneral-purpose circuits, chips, firmware, etc., and the three can beseparate devices or integrated into one device. The embodiments of thepresent disclosure are not limited to this case.

The beneficial effects of the wireless electronic device provided by theembodiments of the present disclosure are basically the same as those ofthe wireless charging and communication circuit provided by theembodiments of the present disclosure, which are not repeated hereinagain.

Those skilled in the art can understand that each block in thesestructural block diagrams and/or block diagrams and/or flow diagrams andcombinations of blocks in these block diagrams and/or block diagramsand/or flow diagrams may be implemented by computer programinstructions. Those skilled in the art can understand that thesecomputer program instructions may be provided to a general-purposecomputer, a professional computer, or a processor implementing otherprogrammable data processing method to implement the scheme specified inthe plurality of blocks or blocks of the structural block diagramsand/or block diagrams and/or flow diagrams of the present disclosure bythe computer or the processor implementing other programmable dataprocessing method.

Those skilled in the art can understand that steps, measures, andschemes in various operations, methods and processes that are discussedin this disclosure can be alternated, modified, combined, or deleted.Furthermore, other steps, measures and schemes in various operations,methods and processes already discussed in this disclosure can also bealternated, changed, rearranged, decomposed, combined or deleted.Further, steps, measures, and schemes of various operations, methods,and processes disclosed in this disclosure in the prior art can also bealternated, modified, rearranged, decomposed, combined, or deleted.

The above is only part of the embodiments of the present disclosure, andit should be pointed out that for those of ordinary skill in the art,several improvements and embellishments can be made without departingfrom the principles of the present disclosure, and these improvementsand embellishments should also be regarded as the scope of protection ofthe present disclosure.

1. A charging circuit, comprising a receiving circuit and a signalprocessing circuit coupled to the receiving circuit, wherein thereceiving circuit is configured to receive electric energy wirelesslytransmitted by a transmitting circuit and wirelessly transmit a feedbacksignal to the transmitting circuit according to the electric energy; andthe signal processing circuit is configured to receive a control signalwirelessly transmitted by the transmitting circuit and process thecontrol signal.
 2. The charging circuit according to claim 1, whereinthe receiving circuit comprises a first energy storage circuit, a firstcapacitor, a rectification circuit, and a feedback circuit; a firstterminal of the first energy storage circuit is coupled to a firstterminal of the first capacitor, a second terminal of the first energystorage circuit is coupled to a first terminal of the rectificationcircuit, and the first energy storage circuit is configured to receivethe electric energy wirelessly transmitted by the transmitting circuit;a second terminal of the first capacitor is coupled to a second terminalof the rectification circuit; a third terminal of the rectificationcircuit is coupled to a first voltage terminal, and the rectificationcircuit is configured to convert the electric energy into adirect-current voltage and output the direct-current voltage to thefeedback circuit; and the feedback circuit is coupled to therectification circuit, and is configured to generate the feedback signalaccording to the direct-current voltage and wirelessly transmit thefeedback signal to the transmitting circuit through the first energystorage circuit.
 3. The charging circuit according to claim 2, whereinthe feedback circuit comprises a load modulation control terminal, afirst switch sub-circuit, a load modulation resistor, and a loadresistor; the load modulation control terminal is coupled to a firstterminal of the first switch sub-circuit; a second terminal of the firstswitch sub-circuit is coupled to a first terminal of the load modulationresistor, a third terminal of the first switch sub-circuit is coupled tothe first voltage terminal, and the first switch sub-circuit isconfigured to receive a modulation signal, input from the loadmodulation control terminal, for modulating a load and to be turned onor turned off according to the modulation signal; a first terminal ofthe load resistor is coupled to a second terminal of the load modulationresistor and the rectification circuit, and a second terminal of theload resistor is coupled to the first voltage terminal; and the loadmodulation resistor and the load resistor are configured to modulate aresistance value of the feedback circuit, according to a turn-on stateand a turn-off state of the first switch sub-circuit, to form thefeedback signal.
 4. The charging circuit according to claim 2, whereinthe feedback circuit comprises a load modulation control terminal, asecond switch sub-circuit, a load modulation capacitor, and a matchingcapacitor; the load modulation control terminal is coupled to a firstterminal of the second switch sub-circuit; a second terminal of thesecond switch sub-circuit is coupled to a first terminal of the loadmodulation capacitor, and a third terminal of the second switchsub-circuit is coupled to the first voltage terminal; a first terminalof the matching capacitor is coupled to the second terminal of the firstcapacitor, and a second terminal of the matching capacitor is coupled tothe second terminal of the first energy storage circuit; and a secondterminal of the load modulation capacitor is coupled to the firstterminal of the matching capacitor.
 5. The charging circuit according toclaim 1, wherein the signal processing circuit comprises a decodingcircuit, and the decoding circuit is coupled to the receiving circuit;and the decoding circuit is configured to receive the control signalwirelessly transmitted by the transmitting circuit and decode thecontrol signal.
 6. The charging circuit according to claim 5, whereinthe decoding circuit comprises a first signal input terminal, a secondsignal input terminal, a high-pass filtering circuit, a switch circuit,a third capacitor, a resistance-capacitance charging circuit, acomparison circuit, a fourth capacitor, and a signal output terminal;the first signal input terminal is of coupled to the receiving circuitand is configured to receive the control signal transmitted by thetransmitting circuit; a first terminal of the high-pass filteringcircuit is coupled to the first signal input terminal, and a secondterminal of the high-pass filtering circuit is coupled to a firstterminal of the switch circuit; a second terminal of the switch circuitis coupled to the comparison circuit, and a third terminal of the switchcircuit is coupled to a first voltage terminal; a first terminal of thethird capacitor is coupled to the second signal input terminal, and asecond terminal of the third capacitor is coupled to the first voltageterminal; a first terminal of the resistance-capacitance chargingcircuit is coupled to the second signal input terminal, and a secondterminal of the resistance-capacitance charging circuit is coupled tothe first voltage terminal; the comparison circuit is coupled to theresistance-capacitance charging circuit, the second signal inputterminal, the signal output terminal, and the first voltage terminal;and a first terminal of the fourth capacitor is coupled to the signaloutput terminal, and a second terminal of the fourth capacitor iscoupled to the first voltage terminal.
 7. The charging circuit accordingto claim 6, wherein the comparison circuit comprises a comparator and alogic inversion circuit, and the decoding circuit further comprises aresistance voltage division circuit; a non-inverting terminal of thecomparator is coupled to the second terminal of the switch circuit, aninverting terminal of the comparator is coupled to the resistancevoltage division circuit, a first power supply terminal of thecomparator is coupled to the second signal input terminal, a secondpower supply terminal of the comparator is coupled to the first voltageterminal, and an output terminal of the comparator is coupled to a firstinput terminal of the logic inversion circuit; a second input terminalof the logic inversion circuit is coupled to the second signal inputterminal, and an output terminal of the logic inversion circuit iscoupled to the signal output terminal; and a first terminal of theresistance voltage division circuit is coupled to the second signalinput terminal, and a second terminal of the resistance voltage divisioncircuit is coupled to the first voltage terminal.
 8. The chargingcircuit according to claim 6, wherein the comparison circuit comprises atrigger circuit, and the decoding circuit further comprises a fifthcapacitor; a first trigger terminal of the trigger circuit and a secondtrigger terminal of the trigger circuit are both coupled to the secondterminal of the switch circuit, a power supply terminal of the triggercircuit and a reset terminal of the trigger circuit are both coupled tothe second signal input terminal, a control terminal of the triggercircuit is coupled to a first terminal of the fifth capacitor, adischarge terminal of the trigger circuit and a ground terminal of thetrigger circuit are both coupled to the first voltage terminal, and anoutput terminal of the trigger circuit is coupled to the signal outputterminal; and a second terminal of the fifth capacitor is coupled to thefirst voltage terminal.
 9. An electronic device, comprising a maincontroller, a communication controller, a power receiving controller,and the charging circuit according to claim 1, wherein the powerreceiving controller and the communication controller are both coupledto the charging circuit; and the power receiving controller and thecommunication controller are both coupled to the main controller. 10.The electronic device according to claim 9, further comprising anelectronic tag, wherein the electronic tag is coupled to the powerreceiving controller.
 11. The electronic device according to claim 10,wherein the electronic tag comprises an electronic ink screen, and theelectronic ink screen is configured to be supplied with power by thepower receiving controller.
 12. A charging circuit, comprising atransmitting circuit, wherein the transmitting circuit is configured towirelessly transmit electric energy to a receiving circuit, receive afeedback signal of the receiving circuit, and wirelessly transmit acontrol signal to the receiving circuit.
 13. The charging circuitaccording to claim 12, wherein the transmitting circuit comprises acontrol circuit and a second energy storage circuit coupled to thecontrol circuit, and the control circuit is also coupled to a powersupply other than the charging circuit.
 14. The charging circuitaccording to claim 13, wherein the control circuit comprises a thirdenergy storage circuit, a unidirectional conduction sub-circuit, a thirdswitch sub-circuit, a feedback detection resistor, a load modulationfeedback terminal, a power input terminal, and a third signal inputterminal; a first terminal of the third energy storage circuit iscoupled to the power input terminal, and a second terminal of the thirdenergy storage circuit is coupled to a first terminal of the secondenergy storage circuit; a first terminal of the unidirectionalconduction sub-circuit is coupled to a second terminal of the secondenergy storage circuit, and a second terminal of the unidirectionalconduction sub-circuit is coupled to the first terminal of the thirdenergy storage circuit; a first terminal of the third switch sub-circuitis coupled to the second terminal of the second energy storage circuit,a second terminal of the third switch sub-circuit is coupled to a firstterminal of the feedback detection resistor and the load modulationfeedback terminal, a third terminal of the third switch sub-circuit iscoupled to the third signal input terminal, and the third switchsub-circuit is configured to be turned on or turned off according to acharging control signal input by the third signal input terminal; and asecond terminal of the feedback detection resistor is coupled to a firstvoltage terminal.
 15. The charging circuit according to claim 14,wherein the third switch sub-circuit is a field-effect transistor, andthe first terminal of the third switch sub-circuit, the second terminalof the third switch sub-circuit, and the third terminal of the thirdswitch sub-circuit are respectively a drain electrode of thefield-effect transistor, a source electrode of the field-effecttransistor, and a gate electrode of the field-effect transistor; and theunidirectional conduction sub-circuit is a diode, and the first terminalof the unidirectional conduction sub-circuit and the second terminal ofthe unidirectional conduction sub-circuit are a positive electrode ofthe diode and a negative electrode of the diode, respectively.
 16. Thecharging circuit according to claim 13, wherein the control circuitcomprises a fourth switch sub-circuit, a fourth signal input terminal, afifth switch sub-circuit, a fifth signal input terminal, a third energystorage circuit, a power input terminal, a feedback detection resistor,and a load modulation feedback terminal; a first terminal of the fourthswitch sub-circuit is coupled to the power input terminal, a secondterminal of the fourth switch sub-circuit is coupled to a first terminalof the third energy storage circuit, a third terminal of the fourthswitch sub-circuit is coupled to the fourth signal input terminal, andthe fourth switch sub-circuit is configured to be turned on or turnedoff according to a first charging control signal input by the fourthsignal input terminal; a first terminal of the fifth switch sub-circuitis coupled to the second terminal of the fourth switch sub-circuit, asecond terminal of the fifth switch sub-circuit is coupled to a firstterminal of the feedback detection resistor, a third terminal of thefifth switch sub-circuit is coupled to the fifth signal input terminal,and the fifth switch sub-circuit is configured to be turned on or turnedoff according to a second charging control signal input by the fifthsignal input terminal; the first terminal of the feedback detectionresistor is coupled to the load modulation feedback terminal, a secondterminal of the feedback detection resistor is coupled to a firstvoltage terminal, and the feedback detection resistor is configured torespond to the feedback signal transmitted by the receiving circuit andoutput the feedback signal through the load modulation feedbackterminal; and a second terminal of the third energy storage circuit isconnected to a first terminal of the second energy storage circuit, anda second terminal of the second energy storage circuit is coupled to thefirst voltage terminal.
 17. The charging circuit according to claim 16,wherein the fourth switch sub-circuit is a first field-effecttransistor, and the first terminal of the fourth switch sub-circuit, thesecond terminal of the fourth switch sub-circuit, and the third terminalof the fourth switch sub-circuit are respectively a drain electrode ofthe first field-effect transistor, a source electrode of the firstfield-effect transistor, and a gate electrode of the first field-effecttransistor; and the fifth switch sub-circuit is a second field-effecttransistor, and the first terminal of the fifth switch sub-circuit, thesecond terminal of the fifth switch sub-circuit, and the third terminalof the fifth switch sub-circuit are respectively a drain electrode ofthe second field-effect transistor, a source electrode of the secondfield-effect transistor, and a gate electrode of the second field-effecttransistor.
 18. An electronic device, comprising a power supply, a maincontroller, a communication controller, a power supply controller, andthe charging circuit according to claim 12, wherein the communicationcontroller and the power supply controller are both coupled to thecharging circuit.
 19. A charging circuit system, comprising a receivingcircuit, a signal processing circuit, and a transmitting circuit,wherein the receiving circuit is configured to receive electric energywirelessly transmitted by the transmitting circuit and wirelesslytransmit a feedback signal to the transmitting circuit according to theelectric energy; the signal processing circuit is configured to receivea control signal wirelessly transmitted by the transmitting circuit andprocess the control signal; and the transmitting circuit is configuredto wirelessly transmit the electric energy to the receiving circuit,receive the feedback signal of the receiving circuit, and wirelesslytransmit the control signal to the receiving circuit.
 20. An electronicdevice, comprising a main controller, a communication controller, apower receiving controller, and the charging circuit according to claim2, wherein the power receiving controller and the communicationcontroller are both coupled to the charging circuit; and the powerreceiving controller and the communication controller are both coupledto the main controller.